Estudio in vitro de la capacidad adhesiva de cuatro adhesivos autograbantes en ortodoncia

Abstract

Introduction: recently, self-etching primers with possible antibacterial properties have been introduced in the market. Purpose: to determine if the bond strength of the orthodontic bonding system Transbond XT (3M Unitek) used in combination with the self-etching primers Clearfil Protect Bond (CPB), Clearfil SE Bond (CSB), Transbond Plus Self Etching Primer (TSEP) and iBond is equal to that obtained using Transbond XT with the traditional acid etch technique. Materials and methods: brackets were bonded to extracted human premolars using Transbond XT. Bonding was carried out following one of five procedures for enamel preparation (1) Phosphoric acid etching at 37%; (2) CPB; (3) CSB; (4) TSEP and (5) iBond. Shear bond strength was measured with a universal test machine, the cross-head set at a speed of 1 mm/min. Bond material remaining on teeth after debonding was quantified using image analysis equipment. Scanning electron microscope (SEM) was used to observe the effects of conditioning of each product on the enamel. Results: iBond showed significantly less bond strength and less bond material remaining on the teeth after debonding than either self etching primers or conventional acid etch technique (p<0.001). SEM observations showed that the etching effect of TSEP is equal to that obtained using traditional acid etch technique. However, CPB and CSB show a more conservative pattern, and iBond resulted in a fine surface roughening and pitted enamel surfaces. Conclusions: the self-etching primers evaluated, except iBond, are a good alternative to conventional bracket bonding.